Solutions Without warning or notice has 11 entries with similar clues
- raidSearch by police without warning
- signalWarning notice
- suddenHappening without warning
- pop-offLeave without warning
- pack-offSend someone somewhere without much notice
- creep-upApproach slowly and without warning
- keep-outWarning notice to trespassers
- up-sticksMove away without warning
- spot-checkA test made without warning on a randomly selected subject
- all-at-onceWithout warning; not one by one
- all-of-a-suddenWithout warning